Quote -
Face-off would not work for you anyway as it is dependant on the main light in the scene for it's calculations. You would have no way of knowing where a user may put the lights. Matmatic doesn't have this limitation and should do what you want :)

that's inaccurate.  face_off's script was more specific than Matmatic, that's all.  Matmatic is just a programmatic interface.  it is entirely possible to make light specific shaders with Matmatic.  if one isn't careful about one's initial suppositions, one could easily find oneself making completely light specific shaders.  face_off knew his shaders were light specific, and made a script to account for that.  anyone else will have to do rigorous testing to make sure their shaders are not actually light dependent.  just by eyeballing, i'd say most i've used are, and either work in very light settings, very dark settings, or very extreme settings.  very, very, very few actually work independent of lighting.

anyway, when you're defining relationships in your initial equations, you have to be careful that you're defining them generally enough.

sure you can distribute the results, but you couldn't distribute your own realism kit. face_off's realism kits worked on any texture and bump map.  that's very different than your own V4 material.  or room material for that matter.